1 a) 9 958 + 20 = b) 9 958 + 12 = c) 9 958 + 73 = d) 9 958 - 95 =

2 a) 99 991 + 13 = b) 99 992 +130 = c) 99 993 + 77 = d) 99 994 + 177 =

3 a) 10 005 - 25 = b) 10 005 - 250 = c) 10 005 - 85 = d) 10 005 - 850 =

4 a) 100 004 - 6 = b) 100 004 - 60 = c) 100 004 - 9 = d) 100 004 - 90 =